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The mission goal for the International Space Station Alpha (ISSA) is to establish an international orbiting laboratory for the advancement of a wide range of scientific and technical research. To meet this goal, the ISSA is assembled by element with incremental capabilities until the assembly sequence completion and the beginning of its ten year life. To accomplish its goals, the ISSA is outfitted to support scientific research and is outfitted for habitability of the crew. Habitable modules, systems, external systems and fixtures, and numerous components are assembled together following an assembly sequence to form the ISSA. These pieces are launched on various vehicles and connected together on-orbit. Pressurized modules are the cornerstones of the ISSA, providing living and working quarters for crew and housing for payloads. This paper describes the latest assembly sequence, the assembly sequence milestones for habitability, and the pressurized modules.

The International Space Station (ISS) water balance is evolving throughout the assembly phase. The ISS and its environmental control system become progressively more complex as new modules are added. This build-up results in various forms of water supply and water consumption rates. The Russian and United States water balances are integrated to form an ISS water balance. The changes in the water balance as the ISS grows and as the crew complement changes are discussed. The actual versus predicted usage rates are shown through each expedition crew.